There is a difference in screen size (43 Inch (109.22 cm) vs 40 Inch (102 cm)), and a larger screen generally provides a more immersive viewing experience. Both TVs come with smart platforms that support popular streaming apps and voice control features. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. If you're comparing Westinghouse WD43UB4530 and TCL 40S355-CA, both models come with modern features and are designed to deliver a solid viewing experience across different use cases. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. Westinghouse WD43UB4530 and TCL 40S355-CA differ in resolution (4K 3840 x 2160 vs 1920 x 1080), which can affect overall clarity and sharpness of the display. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content.

Verdict: Choosing between Westinghouse WD43UB4530 and TCL 40S355-CA depends on your usage, whether you prioritize display quality, smoother motion, or smart features.